From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 579B84F145; Thu, 28 Sep 2023 15:48:42 +0000 (UTC) Received: from out3-smtp.messagingengine.com (out3-smtp.messagingengine.com [66.111.4.27]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D9BD0EB; Thu, 28 Sep 2023 08:48:39 -0700 (PDT) Received: from compute6.internal (compute6.nyi.internal [10.202.2.47]) by mailout.nyi.internal (Postfix) with ESMTP id 4F0615C0DBB; Thu, 28 Sep 2023 11:48:39 -0400 (EDT) Received: from imap51 ([10.202.2.101]) by compute6.internal (MEProxy); Thu, 28 Sep 2023 11:48:39 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arndb.de; h=cc :cc:content-type:content-type:date:date:from:from:in-reply-to :in-reply-to:message-id:mime-version:references:reply-to:sender :subject:subject:to:to; s=fm1; t=1695916119; x=1696002519; bh=AE M/fDbI9O0BImAELzI+hfXsnObtdXB3nh8ZZCXXqn0=; b=rYRrfUWcGURzZi2Kx3 x77+TyShR9Sib8UhEkjRsEvF3DnYBPdVY6rzWwYeuhr4tdntul3oHtfVUF/z6EV2 heYFaG3+Ohoslr/oEpgzvbQj8Ap/BO0Uo8fukRIGEYSG2EFeIuADh6kTnG/e/ZnK WKoyOI7jTOa1WvXs1EnNIde2dL42+ityLyFsYeIVnenJ8nJu5KRjOGJhaF2H5eLA 4Rc3nmIeAUGsRgwN8l/vUa6uyPahwW8/lYYQtjTd1GdPmcRjEc4yki4fcm3o+0bg CM1ceI9x2XAIhPoWvIWcG7Pse0IJVI89HVvLU8Sx5WjoReHRv+R8kwtcD43rgTqO 1Txg== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-type:content-type:date:date :feedback-id:feedback-id:from:from:in-reply-to:in-reply-to :message-id:mime-version:references:reply-to:sender:subject :subject:to:to:x-me-proxy:x-me-proxy:x-me-sender:x-me-sender :x-sasl-enc; s=fm2; t=1695916119; x=1696002519; bh=AEM/fDbI9O0BI mAELzI+hfXsnObtdXB3nh8ZZCXXqn0=; b=SVhvpMNNu2832r96OQM+NAupTyZUu 9ApC30lDjAFYMGWGRYhGk9Ktw4UV75/4wX1D/NFDsHe0J/F4WGv8mVpKtbEtvn7p Rmjsr58zIcRx0QQa/XsGbKIRMC4kmp2y+lV4iGP4YPyx6mdJFfcRgxpTGWbUkYul fg2q9Uk1M3TSIwSOpuuTWD6z9oXV7akZjN8oooViePicLGd71ehHsuxX95jowg+t sIH70F+Njj7J5uzvO8LCP4IepniwS53HFBN7DFlHjczusBIIb6hJ6o+OFnMH7yBO ef+exyTTPsXWvxZc+NE+84UqAYqQq2LcMfq4tomSwJikU7iHJ9es8eYXA== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvkedrtddtgdeifecutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenuc fjughrpefofgggkfgjfhffhffvvefutgesthdtredtreertdenucfhrhhomhepfdetrhhn ugcuuegvrhhgmhgrnhhnfdcuoegrrhhnugesrghrnhgusgdruggvqeenucggtffrrghtth gvrhhnpeevhfffledtgeehfeffhfdtgedvheejtdfgkeeuvefgudffteettdekkeeufeeh udenucffohhmrghinhepkhgvrhhnvghlrdhorhhgnecuvehluhhsthgvrhfuihiivgeptd enucfrrghrrghmpehmrghilhhfrhhomheprghrnhgusegrrhhnuggsrdguvg X-ME-Proxy: Feedback-ID: i56a14606:Fastmail Received: by mailuser.nyi.internal (Postfix, from userid 501) id BE4B9B60089; Thu, 28 Sep 2023 11:48:38 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.9.0-alpha0-958-g1b1b911df8-fm-20230927.002-g1b1b911d Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <6020d6e7-b187-4abb-bf38-dc09d8bd0f6d@app.fastmail.com> In-Reply-To: <20230928110554.34758-2-jlayton@kernel.org> References: <20230928110554.34758-1-jlayton@kernel.org> <20230928110554.34758-2-jlayton@kernel.org> Date: Thu, 28 Sep 2023 11:48:16 -0400 From: "Arnd Bergmann" To: "Jeff Layton" , "Alexander Viro" , "Christian Brauner" , "Linus Torvalds" , "David Sterba" , "Amir Goldstein" , "Theodore Ts'o" , "Eric W. Biederman" , "Kees Cook" , "Jeremy Kerr" , "Michael Ellerman" , "Nicholas Piggin" , "Christophe Leroy" , "Heiko Carstens" , "Vasily Gorbik" , "Alexander Gordeev" , "Christian Borntraeger" , "Sven Schnelle" , "Greg Kroah-Hartman" , =?UTF-8?Q?Arve_Hj=C3=B8nnev=C3=A5g?= , "Todd Kjos" , "Martijn Coenen" , "Joel Fernandes" , "Carlos Llamas" , "Suren Baghdasaryan" , "Mattia Dongili" , "Dennis Dalessandro" , "Jason Gunthorpe" , "Leon Romanovsky" , "Brad Warrum" , "Ritu Agarwal" , "Hans de Goede" , =?UTF-8?Q?Ilpo_J=C3=A4rvinen?= , "Mark Gross" , "Jiri Slaby" , "Eric Van Hensbergen" , "Latchesar Ionkov" , "Dominique Martinet" , "Christian Schoenebeck" , "David Sterba" , "David Howells" , "Marc Dionne" , "Ian Kent" , "Luis de Bethencourt" , "Salah Triki" , "Tigran A. Aivazian" , "Chris Mason" , "Josef Bacik" , "Xiubo Li" , "Ilya Dryomov" , "Jan Harkes" , coda@cs.cmu.edu, "Joel Becker" , "Christoph Hellwig" , "Nicolas Pitre" , "Rafael J . Wysocki" , "Ard Biesheuvel" , "Gao Xiang" , "Chao Yu" , "Yue Hu" , "Jeffle Xu" , "Namjae Jeon" , "Sungjong Seo" , "Jan Kara" , "Andreas Dilger" , "Jaegeuk Kim" , "OGAWA Hirofumi" , "Christoph Hellwig" , "Miklos Szeredi" , "Bob Peterson" , "Andreas Gruenbacher" , "Richard Weinberger" , "Anton Ivanov" , "Johannes Berg" , "Mikulas Patocka" , "Mike Kravetz" , "Muchun Song" , "Jan Kara" , "David Woodhouse" , "Dave Kleikamp" , "Tejun Heo" , "Trond Myklebust" , "Anna Schumaker" , "Chuck Lever" , "Neil Brown" , "Olga Kornievskaia" , "Dai Ngo" , "Tom Talpey" , "Ryusuke Konishi" , "Anton Altaparmakov" , "Konstantin Komarov" , "Mark Fasheh" , "Joseph Qi" , "Bob Copeland" , "Mike Marshall" , "Martin Brandenburg" , "Luis Chamberlain" , "Iurii Zaikin" , "Tony Luck" , "Guilherme G. Piccoli" , "Anders Larsen" , "Steve French" , "Paulo Alcantara" , "Ronnie Sahlberg" , "Shyam Prasad N" , "Sergey Senozhatsky" , "Phillip Lougher" , "Steven Rostedt" , "Masami Hiramatsu" , "Evgeniy Dushistov" , "Chandan Babu R" , "Darrick J. Wong" , "Damien Le Moal" , "Naohiro Aota" , "Johannes Thumshirn" , "Alexei Starovoitov" , "Daniel Borkmann" , "Andrii Nakryiko" , "Martin KaFai Lau" , "Song Liu" , "Yonghong Song" , "John Fastabend" , "KP Singh" , "Stanislav Fomichev" , "Hao Luo" , "Jiri Olsa" , "Hugh Dickins" , "Andrew Morton" , "David S . Miller" , "Eric Dumazet" , "Jakub Kicinski" , "Paolo Abeni" , "John Johansen" , "Paul Moore" , "James Morris" , "Serge E. Hallyn" , "Stephen Smalley" , "Eric Paris" Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-rdma@vger.kernel.org, linux-serial@vger.kernel.org, linux-usb@vger.kernel.org, v9fs@lists.linux.dev, linux-afs@lists.infradead.org, autofs@vger.kernel.org, linux-btrfs@vger.kernel.org, ceph-devel@vger.kernel.org, codalist@coda.cs.cmu.edu, linux-efi@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, gfs2@lists.linux.dev, linux-um@lists.infradead.org, linux-mtd@lists.infradead.org, jfs-discussion@lists.sourceforge.net, linux-nfs@vger.kernel.org, linux-nilfs@vger.kernel.org, linux-ntfs-dev@lists.sourceforge.net, ntfs3@lists.linux.dev, ocfs2-devel@lists.linux.dev, linux-karma-devel@lists.sourceforge.net, devel@lists.orangefs.org, linux-unionfs@vger.kernel.org, linux-hardening@vger.kernel.org, reiserfs-devel@vger.kernel.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-trace-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, bpf@vger.kernel.org, Netdev , apparmor@lists.ubuntu.com, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Subject: Re: [PATCH 86/87] fs: switch timespec64 fields in inode to discrete integers Content-Type: text/plain X-Spam-Status: No, score=-2.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL,SPF_HELO_PASS,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net On Thu, Sep 28, 2023, at 07:05, Jeff Layton wrote: > This shaves 8 bytes off struct inode, according to pahole. > > Signed-off-by: Jeff Layton FWIW, this is similar to the approach that Deepa suggested back in 2016: https://lore.kernel.org/lkml/1452144972-15802-3-git-send-email-deepa.kernel@gmail.com/ It was NaKed at the time because of the added complexity, though it would have been much easier to do it then, as we had to touch all the timespec references anyway. The approach still seems ok to me, but I'm not sure it's worth doing it now if we didn't do it then. Arnd